Nothing at all.
I try the link in three different browsers. Google Chrome, Mozilla Firefox, and Internet Explorer all offer the same result. No video.
I click the "Other Viewing Options" tab, and try them all. I think I'm getting closer to seeing the conference as QuickTime is "negotiating" with NASA. But still, nothing.
Even the NASA app on my iPhone, the one that NASA released, that has a NASA TV section on it, tells me it can't retrieve the current NASA TV schedule.
Now I knew they weren't going to tell me that the found life on another world or anything. But I waited until 2:00PM to take my lunch break so I wouldn't miss the coverage regardless. Maybe the press release they put out built up so much interest that everyone was going online at the same time, preventing us all from seeing the video feed. But considering the hype they helped create, you'd think NASA would have been ready to get their servers slammed.
As indicated by the title of the post, I'm severely let down. It's now 2:30PM, and I'll be going back to work. Here is the featured article that NASA put up. You can read about the discovery there. Just don't bother clicking the link to watch the live press conference.
Sorry for the rant. I'll write about the Science paper once I can get my hands on it, and without any sensationalist buildup, discuss the implications of the research it presents. I guess all the sciences are plagued with the same media disease. Here I was thinking paleontology just got picked on all the time.